Headcanon; a first time for everything
The first use of magic which Lily was able to recall happened when she was five years old.
She had been at a family party over the Summer celebrating her Auntie’s 40th birthday.
Her cousin—who was three years older than Lily—had coerced Lily into going to explore the woods which the house backed onto, against their parents wishes. Petunia had adamantly said no, but Lily had always been the more adventurous of the two sisters, and had followed him obligingly.
It wasn’t long until the two children were returning to the garden, Lily’s brand new dress ripped and coated in mud from the stream which she had slipped and fallen into, and her mother had been far less than impressed by the whole ordeal.
It had been made worse when her cousin chucked the blame at her, insisting Lily had wandered off and he had followed solely to bring her back to the party. She had gotten into a lot of trouble for that, both for disobeying her mum when she was told to not go anywhere, and for ruining her dress.
Lily wasn’t at all happy to have been told off, and in the midst of yelling that she wanted to go home the crystal glass which her mother was holding smashed into little pieces.
This was only the first of many odd occurrences which surrounded the young girl whilst she was growing up, it threw both Lily and her family off a fair bit, but Lily rather enjoyed testing the limits of what she was able to do—she would try and shut doors without touching them, she would jump from the swing once she’d gotten it to a decent height and giggle as she floated to the ground and landed on her feet without a scratch on her. Once she was 9 and had befriended Severus, the rather odd little boy that lived on the other side of the park, she was all too quick to believe the stories that he shared with her. Hogwarts and the Wizarding World sounded like a dream, a fantasy, like something straight out of one of the books she enjoyed reading as a child. She wanted it to be real and she clung to it, but she wouldn’t tell her parents about any of it, she was sure that they would think her mad.
Coincidentally, at 9 years of age, her mother and father had also seen fit to pull her out of the Muggle primary school which she had attended. Too many strange things seemed to be happening around the redhead and her parents had been called in to speak to her teachers on more than one occasion. Apparently the likes of but the book set itself on fire, Miss and similar excuses weren’t all that believable. Nothing made sense to her mum and dad, they were both terrified and confused and it wasn’t until Lily was 11 and an elderly bloke dressed in rather strange, colourful robes appeared on their doorstep and told them their youngest daughter was a witch that things clicked into place.